Autometer Carbon Fiber 52mm 30 PSI Mechanical Boost GaugeBrand AutoMeter Part Number 4703 Category Gauges & Pods Gauges Condition Brand New Original Manufacturer Packaging The Standard In The Industry, Autometers Mechanical Boost Vac Gauges Have Found Their Way Into More Builds Than Any Other. Using A Patented, High Precision Bourdon Tube Meter Movement, There Isnt Another Gauge On The Market That Can Lay Claim To The Levels Of Accuracy Or Durability You" Ll Find Here. A Simple 1 8" Npt Pressure Connection